"Being a young guy, health and safety is a priority to me. It's been a horrible experience."

NPL was this week contacted to respond to Twidle's allegations.

A spokeswoman said they were unable to comment, however, saying they are "duty bound to respect the confidentiality of this personal grievance" and follow proper procedure, in line with the Employment Relation Act 2000.

"We would like to emphasis that the health and safety of all our workers, is of the highest priority," the NPL spokeswoman said.